* we're copying into a `contents` array whose type allows it to contain nulls. Still, it's
       * worth noting that we promise not to put nulls into the array in the first `size` elements.
       * We uphold that promise here because our callers promise that `elements` will not contain
       * nulls in its first `n` elements.
       */
      System.arraycopy(elements, 0, contents, size, n);
      size += n;

       * we're copying into a `contents` array whose type allows it to contain nulls. Still, it's
       * worth noting that we promise not to put nulls into the array in the first `size` elements.
       * We uphold that promise here because our callers promise that `elements` will not contain
       * nulls in its first `n` elements.
       */
      System.arraycopy(elements, 0, contents, size, n);
      size += n;

  }

  public void testPowerSetIteration_manual() {
    ImmutableSet<Integer> elements = ImmutableSet.of(1, 2, 3);
    Set<Set<Integer>> powerSet = powerSet(elements);
    // The API doesn't promise this iteration order, but it's convenient here.
    Iterator<Set<Integer>> i = powerSet.iterator();
    assertEquals(ImmutableSet.of(), i.next());
    assertEquals(ImmutableSet.of(1), i.next());

  }

  public void testPowerSetIteration_manual() {
    ImmutableSet<Integer> elements = ImmutableSet.of(1, 2, 3);
    Set<Set<Integer>> powerSet = powerSet(elements);
    // The API doesn't promise this iteration order, but it's convenient here.
    Iterator<Set<Integer>> i = powerSet.iterator();
    assertEquals(ImmutableSet.of(), i.next());
    assertEquals(ImmutableSet.of(1), i.next());

import org.apache.maven.api.services.model.ProfileActivator;

/**
 * Determines profile activation based on the existence or value of some execution property.
 *
 * @see ActivationProperty
 */
@Named("property")
@Singleton
public class PropertyProfileActivator implements ProfileActivator {

    @Override
    public boolean isActive(Profile profile, ProfileActivationContext context, ModelProblemCollector problems) {

    private static final Pattern FILTER_3 = Pattern.compile("\\."); // used for split now

    @Override
    public boolean isActive(Profile profile, ProfileActivationContext context, ModelProblemCollector problems) {
        Activation activation = profile.getActivation();

        if (activation == null) {
            return false;
        }

        String jdk = activation.getJdk();

/**
 * Determines profile activation based on the operating system of the current runtime platform.
 *
 * @see ActivationOS
 */
@Named("os")
@Singleton
public class OperatingSystemProfileActivator implements ProfileActivator {

    private static final String REGEX_PREFIX = "regex:";

    @Override

    public List<RemoteRepository> getRemotePluginRepositories() {
        return remotePluginRepositories;
    }

    public void setActiveProfiles(List<Profile> activeProfiles) {
        this.activeProfiles = activeProfiles;
    }

    public List<Profile> getActiveProfiles() {
        return activeProfiles;
    }

    public void setInjectedProfileIds(String source, List<String> injectedProfileIds) {

                .collect(Collectors.toMap(Profile::getId, Profile::getActivation));
    }

    private Model injectProfileActivations(Model model, Map<String, Activation> activations) {
        List<Profile> profiles = new ArrayList<>();
        boolean modified = false;
        for (Profile profile : model.getProfiles()) {
            Activation activation = profile.getActivation();
            if (activation != null) {

                "only-active-profile",
                "Active only ||${project.basedir}||",
                "<plugin-in-active-profile-only>Active only ||${project.basedir}||</plugin-in-active-profile-only>");

        // =============================================

        Profile inactiveProfile = originalModel.getProfiles().stream()
                .filter(profile -> profile.getId().equals("inactiveProfile"))